N-400: Outside US for more than 6 months.

My Dad's application got approved - they were convinced that had intended to come back.

Since my mom and dad travelled together for more than 6 months, should we apply for my Mom now?

How well would the argument that since dad was approved, my mom intended to come back with him.

One caveat could be that my parents haven't stayed together most of the time in US.
 
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